US8342016B2 - Method for evaluating the transversal grip of a tire on a snow covered ground - Google Patents

Method for evaluating the transversal grip of a tire on a snow covered ground Download PDF

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Publication number
US8342016B2
US8342016B2 US12/668,875 US66887508A US8342016B2 US 8342016 B2 US8342016 B2 US 8342016B2 US 66887508 A US66887508 A US 66887508A US 8342016 B2 US8342016 B2 US 8342016B2
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Prior art keywords
transversal
evaluation method
discriminating
transversal acceleration
turn
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Expired - Fee Related, expires
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US12/668,875
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US20100294031A1 (en
Inventor
Fabrice Le Royer
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Michelin Recherche et Technique SA Switzerland
Compagnie Generale des Etablissements Michelin SCA
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Michelin Recherche et Technique SA Switzerland
Compagnie Generale des Etablissements Michelin SCA
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Assigned to MICHELIN RECHERCHE ET TECHNIQUE S.A., SOCIETE DE TECHNOLOGIE MICHELIN reassignment MICHELIN RECHERCHE ET TECHNIQUE S.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LE ROYER, FABRICE
Publication of US20100294031A1 publication Critical patent/US20100294031A1/en
Assigned to COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN reassignment COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN MERGER (SEE DOCUMENT FOR DETAILS). Assignors: SOCIETE DE TECHNOLOGIE MICHELIN
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/007—Wheeled or endless-tracked vehicles
    • G01M17/02—Tyres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C99/00—Subject matter not provided for in other groups of this subclass
    • B60C99/006—Computer aided tyre design or simulation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/007—Wheeled or endless-tracked vehicles
    • G01M17/06—Steering behaviour; Rolling behaviour
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/15—Vehicle, aircraft or watercraft design
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]

Definitions

  • the invention generally relates to the equipment and safety techniques for automobile vehicles.
  • the invention relates to a method for at least relatively evaluating the transversal grip of a first-type tire on a snow covered ground, comprising at least the steps of providing tires of the first type to a wheeled vehicle, driving the thus equipped vehicle at the transversal grip limit on a snow-covered track comprising at least one turn, and producing instantaneous measures of the transversal acceleration of the vehicle during its travel on the track.
  • transversal grip also called transversal potential
  • the transversal potential of a tire is usually evaluated by a driving test on a ring-like lane, of a predefined diameter, during which test the time period taken by a vehicle to perform a lap at the transversal grip limit is picked up.
  • this technique in which the vehicle follows the same trajectory at each passage, leads, in the case of snow-covered grounds, to large errors due to the rapid changes of the running surface caused by the repetitive passage of the tires on the same tracks.
  • One object of the invention is to provide a method for evaluating the transversal potential of a tire on a snow-covered ground of which repeatability is much higher than that of prior known methods.
  • the track includes at least two discriminating turns selected so as each one requires a travel time period by the vehicle of at least one second, this time period being measured between the end of a phase of growth of the vehicle transversal acceleration starting from a given acceleration threshold and the beginning of a return phase of returning to the vehicle transversal acceleration threshold, and wherein the method comprises at least a filtering step of producing transversal acceleration filtered measures by low-pass filtering the transversal acceleration instantaneous measures, and at least a selection step of identifying, from among the filtered measures, a set of at least one transversal acceleration per discriminating turn, the transversal grip of a tire is judged as being even better the higher the transversal acceleration values obtained for this tire are.
  • driving the vehicle at the transversal grip limit should be understood in the sense known by a man skilled in the art and means “driving the vehicle while constantly remaining as close as possible to the transversal grip limit of the vehicle, but being lower than that limit”.
  • the given transversal acceleration threshold may be advantageously equal to zero.
  • the discriminating turns comprise at least a left turn and a right turn.
  • An embodiment of the method of the invention advantageously comprises at least a correction step of correcting the transversal acceleration filtered measures from any possible local or overall deviation between the values taken by these measures for the left and right turns, respectively.
  • the transversal acceleration measures may be performed while the vehicle covers the track a plurality of times.
  • the track may be composed of a looped car track, which the vehicle covers at least once in the clockwise direction and at least once in the counterclockwise direction.
  • An embodiment of the method of the invention comprises a statistical analysis taking into account a plurality of maximal transversal acceleration values, recorded at each discriminating turn each time a respective coverage of this turn is made.
  • the low-pass filtering such that it is made through a symmetric moving average, to provide the track such that it comprises at least four discriminating turns, and that each discriminating turn be selected such that the required time period for a vehicle to cover it be higher than two seconds, and preferably at least equal to three seconds.
  • the selection step may comprise the operation of discarding the transversal acceleration measures carried out when the vehicle covers each non-discriminating turn.
  • FIG. 1 is a top view of a track which can be used for the implementation of the method of the invention
  • FIG. 2 is a diagram representing on the ordinate, as a function of time represented on the abscise and expressed in seconds, acceleration measures before filtering (dotted curve) and after filtering (solid line curve); and
  • FIG. 3 is a diagram similar to that of FIG. 2 , on which is illustrated, on a curve of filtered measures, the drawing of the maximal transversal acceleration values during the coverage of two successive discriminating turns.
  • the invention relates to a method for evaluating the transversal grip of a tire on a snow-covered ground.
  • the evaluation sought is at least relative, that is, it should at least make it possible to compare and classify the transversal potentials of tires of two different types.
  • this method comprises an experimental phase of substantially providing a wheeled vehicle with tires to be evaluated, driving the thus equipped vehicle at the transversal grip limit on a non-straight, snow-covered track P ( FIG. 1 ), and producing instantaneous measures of the transversal acceleration of the vehicle while it covers the track.
  • the equipment required for the implementation of this experimental phase comprises an accelerometer and an acquisition system, the acquisition system is for recording the output signal of the accelerometer at an appropriate frequency, for example, a frequency of 125 Hz.
  • the track used for the experimental phase includes at least two particular turns such as V 1 to V 4 , which will be called “discriminating”, and the number of which is preferably four.
  • a discriminating turn is a turn of which coverage time period by the vehicle, as measured between the end of the transversal acceleration growing phase of this vehicle starting from zero and the beginning of a phase of returning to zero of this transversal acceleration, is at least equal to a second and preferably equal to three seconds.
  • FIG. 1 illustrates the example, among many other possible examples, of a track which may be advantageously used for the implementation of the method of the invention.
  • This track which is preferably substantially horizontal at least at the turns, is a looped car track which the vehicle may cover a plurality of times and particularly in the clockwise direction and in the counterclockwise direction, and which has a plurality of discriminating turns, among which left turns and right turns.
  • the dotted curve of FIG. 2 gives an example of transversal acceleration instantaneous measures, drawn for a vehicle provided with tires to be evaluated, and running at the grip limit, on such a snow-covered track.
  • the method of the invention comprises an analysis phase.
  • This analysis phase may advantageously begin with a preprocessing of correcting the raw transversal acceleration instantaneous measures so as to take into consideration the inclination taken by the turning vehicle du to the finite value of its roll stiffness.
  • the analysis phase further comprises a filtering step, of low-pass filtering the transversal acceleration instantaneous measures leading to transversal acceleration filtered measures, an example of which is given by the solid line curve of FIG. 2 .
  • This low-pass filtering may notably be made by replacing each transversal acceleration instantaneous measure by a moving average, symmetric with regard to the timing of this instantaneous measure, of the instantaneous measures prior and subsequent to that timing.
  • each transversal acceleration instantaneous measure may thus be replaced by a transversal acceleration filtered measure, considered at the same timing and constituted of an average, centered on this timing, of the 24 instantaneous measures picked up prior to that timing, and 24 instantaneous measures picked up after that timing, each transversal acceleration filtered measure taking thus into account the measures picked up during a 400 ms time span in the case of a sampling frequency equal to 125 Hz.
  • the analysis phase further comprises a selection step of identifying, from among the transversal acceleration filtered measures and for each discriminating turn, a set of one or more transversal acceleration measures relevant with regard to the transversal grip of the tested tire, this grip being judged as being even better the higher the transversal acceleration values obtainable for this tire are.
  • the transversal acceleration average on each discriminating turn, between a first peak corresponding to the end of the transversal acceleration growing phase and a last peak corresponding to the beginning of the return phase of the transversal acceleration to the given threshold s 1 .
  • this average is for example calculated over a time window of at least a given duration T in which the transversal acceleration filtered values are comprised within a range of a magnitude lower than a given threshold s 2 .
  • the duration T is at least equal to a second and the threshold s 2 lower than 0.08 g.
  • Threshold s 3 may be of about 15%.
  • the preferred evaluation criterion of the transversal grip is constituted of the maximal value reached by the transversal acceleration in each discriminating turn, the choice of this criterion thus providing, during each coverage of a discriminating turn, a relevant value such as values ATmax 1 an ATmax 2 illustrated on FIG. 3 .
  • the selection step preferably includes discarding the transversal acceleration measures performed when the vehicle covers each non-discriminating turn.
  • the method of the invention further comprises a correction step of correcting the transversal acceleration filtered measures from any possible local or overall deviation among the values taken by these measures for the left and right turns, respectively.
  • This processing which is implemented after the filtering step and which lies on the hypothesis that the tire performances on a left turn are the same than those on a right turn, thus consists in offsetting the transversal acceleration values by half the deviation observed between the transversal acceleration values obtained on the right turns and on the left turns.
  • the method of the invention advantageously comprises a statistical analysis of all the maximal values obtained for the transversal acceleration, this statistical analysis being particularly relevant in the case where the vehicle covers the track a plurality of times, and where, correlatively, a plurality of transversal acceleration maximal values are available for each discriminating turn.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • General Engineering & Computer Science (AREA)
  • Evolutionary Computation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • Tires In General (AREA)
US12/668,875 2007-07-12 2008-06-05 Method for evaluating the transversal grip of a tire on a snow covered ground Expired - Fee Related US8342016B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0705070A FR2918749B1 (fr) 2007-07-12 2007-07-12 Procede d'evaluation de l'adherence transversale d'un pneu sur un sol enneige
FR0705070 2007-07-12
PCT/FR2008/000762 WO2009007523A2 (fr) 2007-07-12 2008-06-05 Procède d'évaluation de l'adhérence transversale d'un pneu sur un sol enneige

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US20100294031A1 US20100294031A1 (en) 2010-11-25
US8342016B2 true US8342016B2 (en) 2013-01-01

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US12/668,875 Expired - Fee Related US8342016B2 (en) 2007-07-12 2008-06-05 Method for evaluating the transversal grip of a tire on a snow covered ground

Country Status (7)

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US (1) US8342016B2 (fr)
EP (1) EP2171419A2 (fr)
JP (1) JP2010533289A (fr)
CN (1) CN101784875B (fr)
EA (1) EA015479B1 (fr)
FR (1) FR2918749B1 (fr)
WO (1) WO2009007523A2 (fr)

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CN110073476B (zh) 2016-11-28 2023-09-01 默克专利有限公司 具备保护膜的薄膜晶体管基板及其制造方法

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4969212A (en) 1989-02-01 1990-11-06 The Goodyear Tire & Rubber Company Quantitative measurement of handling characteristics of tires and/or vehicle/tire combinations
US5388046A (en) * 1990-11-22 1995-02-07 Mazda Motor Corporation Traction controller for a vehicle
US6155110A (en) * 1997-04-24 2000-12-05 Bridgestone/Firestone, Inc. Method for predicting tire performance on rain groove roadways
US6353777B1 (en) * 2000-08-16 2002-03-05 Ford Global Technologies, Inc. Path correction for lane change analysis
EP1201521A1 (fr) 2000-10-26 2002-05-02 Fuji Jukogyo Kabushiki Kaisha Appareil pour estimer les coefficients de friction d'une route pour véhicule
US20020134149A1 (en) 2000-06-14 2002-09-26 Masaki Shiraishi Vehicle/tire performance simulating method
US6580980B1 (en) * 2002-03-05 2003-06-17 Michelin Recherche Et Technique S.A. System and method for testing deflated tire handling
EP1380972A2 (fr) 2002-07-12 2004-01-14 Sumitomo Rubber Industries Ltd. Méthode de simulation d'un pneu sur la neige
EP1460409A1 (fr) 2003-03-11 2004-09-22 Société de Technologie Michelin Systéme et procédé pour tester le fonctionnement des pneumatiques dégonflés
US6826951B1 (en) * 1998-01-15 2004-12-07 International Marketing, Inc. Tire management system and method for surveying and servicing a vehicle tire
US20050234628A1 (en) 2002-03-01 2005-10-20 Ulrich Luders Method for determining a maximum coefficient of friction
DE102004051654A1 (de) 2004-10-22 2006-04-27 "Stiftung Caesar" (Center Of Advanced European Studies And Research) Beschleunigungssensoren im Reifen
US7142961B2 (en) * 2004-10-05 2006-11-28 Hankook Tire Co., Ltd. Method for quantitatively analyzing steer characteristics to acquire steering stability of vehicles/tires
US7263419B2 (en) * 2001-06-13 2007-08-28 Ricardo Uk Limited Vehicle control

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Publication number Priority date Publication date Assignee Title
JPS63251502A (ja) * 1987-04-07 1988-10-19 日商岩井株式会社 車両用テストコ−ス
JPH09288045A (ja) * 1996-04-23 1997-11-04 Toyo Tire & Rubber Co Ltd タイヤの特性測定方法
JP3906370B2 (ja) * 1997-11-17 2007-04-18 東洋ゴム工業株式会社 タイヤの氷上旋回性能の評価方法
JP3762839B2 (ja) * 1998-11-09 2006-04-05 横浜ゴム株式会社 氷上コーナリングの性能評価方法
JP2000336604A (ja) * 1999-05-31 2000-12-05 Nippon Hodo Co Ltd 車両テストコース路面
JP3253952B1 (ja) * 2000-06-14 2002-02-04 住友ゴム工業株式会社 車両・タイヤ性能のシミュレーション方法
JP2004042831A (ja) * 2002-07-12 2004-02-12 Sumitomo Rubber Ind Ltd タイヤの雪上走行シミュレーション方法

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4969212A (en) 1989-02-01 1990-11-06 The Goodyear Tire & Rubber Company Quantitative measurement of handling characteristics of tires and/or vehicle/tire combinations
US5388046A (en) * 1990-11-22 1995-02-07 Mazda Motor Corporation Traction controller for a vehicle
US6155110A (en) * 1997-04-24 2000-12-05 Bridgestone/Firestone, Inc. Method for predicting tire performance on rain groove roadways
US6826951B1 (en) * 1998-01-15 2004-12-07 International Marketing, Inc. Tire management system and method for surveying and servicing a vehicle tire
US20020134149A1 (en) 2000-06-14 2002-09-26 Masaki Shiraishi Vehicle/tire performance simulating method
US6353777B1 (en) * 2000-08-16 2002-03-05 Ford Global Technologies, Inc. Path correction for lane change analysis
EP1201521A1 (fr) 2000-10-26 2002-05-02 Fuji Jukogyo Kabushiki Kaisha Appareil pour estimer les coefficients de friction d'une route pour véhicule
US7263419B2 (en) * 2001-06-13 2007-08-28 Ricardo Uk Limited Vehicle control
US20050234628A1 (en) 2002-03-01 2005-10-20 Ulrich Luders Method for determining a maximum coefficient of friction
US6580980B1 (en) * 2002-03-05 2003-06-17 Michelin Recherche Et Technique S.A. System and method for testing deflated tire handling
EP1380972A2 (fr) 2002-07-12 2004-01-14 Sumitomo Rubber Industries Ltd. Méthode de simulation d'un pneu sur la neige
EP1460409A1 (fr) 2003-03-11 2004-09-22 Société de Technologie Michelin Systéme et procédé pour tester le fonctionnement des pneumatiques dégonflés
US7142961B2 (en) * 2004-10-05 2006-11-28 Hankook Tire Co., Ltd. Method for quantitatively analyzing steer characteristics to acquire steering stability of vehicles/tires
DE102004051654A1 (de) 2004-10-22 2006-04-27 "Stiftung Caesar" (Center Of Advanced European Studies And Research) Beschleunigungssensoren im Reifen

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G. Phetteplace et al., "Measuring Lateral tire performance on winter surfaces", Tire Science & Technology, Tire Soc. Inc, vol. 35, No. 1, pp. 56-68, Mar. 2007.

Also Published As

Publication number Publication date
JP2010533289A (ja) 2010-10-21
CN101784875B (zh) 2013-01-16
US20100294031A1 (en) 2010-11-25
EA201070132A1 (ru) 2010-06-30
CN101784875A (zh) 2010-07-21
EA015479B1 (ru) 2011-08-30
WO2009007523A3 (fr) 2009-03-19
EP2171419A2 (fr) 2010-04-07
FR2918749B1 (fr) 2009-10-09
FR2918749A1 (fr) 2009-01-16
WO2009007523A2 (fr) 2009-01-15

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